U.S. Group Issues Warning on Iran Attack

By

Julian E. Barnes

Sept. 12, 2012 10:38 p.m. ET

WASHINGTON—A bipartisan group of ambassadors, retired generals and foreign policy experts is warning against a U.S. or Israeli attack on Iran's nuclear facilities without a more thorough public discussion to weigh the costs and benefits.

In a paper and letter to be released Thursday, the group argues that an attack could delay Iran's development of a nuclear weapon for up to four years, but would have other consequences, such as...